|About this Abstract
||2020 TMS Annual Meeting & Exhibition
||Accelerated Materials Evaluation for Nuclear Applications Utilizing Irradiation and Integrated Modeling
||In-situ Observation of Radiation-induced Phase Transformation in U-Mo
||Bei Ye, Weiying Chen, Yinbin Miao, Abdellatif Yacout, Yipeng Gao
|On-Site Speaker (Planned)
The metastable γ-U phase in U-Mo fuels is prone to phase decomposition to become α-U phase and enriched U2Mo, primarily at cell or grain boundaries. This mixture reverses back to the γ-U phase under neutron irradiation. It was speculated that recrystallization in U-Mo fuels may be related to the lattice stresses accumulated during the reordering of lattice atoms from one crystal structure to another, based on previous ion irradiation experiments. Since the recrystallization process accelerates fission gas swelling at high burnup, it is of great importance to investigate whether the α-phase reversal promotes the initiation of recrystallization. In this study, in-situ irradiation was performed at the IVEM-Tandem facility to directly observe the microstructural evolution of decomposed γ-U region under radiation. Results from this study will not only help deepen the fundamental understanding of the defect evolution process during α-phase reversal but also provide critical information for theoretic modeling.